21302033221 has 8 divisors (see below), whose sum is σ = 24358152320. Its totient is φ = 18249157008.

The previous prime is 21302033189. The next prime is 21302033309. The reversal of 21302033221 is 12233020312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21302033221 - 2⁵ = 21302033189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302036221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796626 + ... + 822931.

It is an arithmetic number, because the mean of its divisors is an integer number (3044769040).

Almost surely, 2^21302033221 is an apocalyptic number.

It is an amenable number.

21302033221 is a deficient number, since it is larger than the sum of its proper divisors (3056119099).

21302033221 is a wasteful number, since it uses less digits than its factorization.

21302033221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621443.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21302033221 its reverse (12233020312), we get a palindrome (33535053533).

The spelling of 21302033221 in words is "twenty-one billion, three hundred two million, thirty-three thousand, two hundred twenty-one".